7
420 has four prime factors: 2 3 5 7.
Two factors.
420 has four prime factors: 2,3,5,7
The positive integer factors of 28 are: 1, 2, 4, 7, 14, 28
the factors of 7 are 1 and 7
7 has two different factors. 9 has three different factors. 10 has four different factors. 16 has five different factors. So, the answer is 10.
420 has four prime factors: 2 3 5 7.
Four of them which are: 1, 7, 13 and 91
There are four.
Seven factors.
Two factors.
Two factors.
30 has 7 factors
510510
Two: 1 and 7.
3 and 7 are the two different prime factors of 63. Prime factorization of 63 is 3 x 3 x 7.
Factors of 28 in three different ways are: 14*2, 7*4, 7*2*2 and remember also 28*1.